Indicate what type of test (positive one tail, negative one tail, or two tail) would most likely be used to test each statement/situation below:
1. Students complain that the bottles of water they purchase from vending machines contain less than the 16 ounces they advertise.
2. Mr. Dazs thinks that students who like ice cream have higher IQs than the national average.
3. You think the cost of text books is exactly where it needs to be.
4. You think men and women differ in their preference for chocolate, but you have no idea who would like chocolate more.

A. Positive one-tailed test
B. Negative one-tailed test
C. Two-tailed test